Takoyaki, is chopped peices of tako(octopus) mixed with a btter(like pancakes) and cooked ona special grill that makes them round, you eat it with sauce like tonkatsu sauce and sprinkle ao nori (blue nori) on top and enjoy!
Tonkatsu is made with pork...chicken katsu is made with...well chicken :-0
I love them all...and my favorite is Hiroshima style okonomiyaki !!!